Toro Pro Sweep 5200 Service Manual page 37

Hydraulic Manifold Service
1. Make sure the control manifold is clean before re-
moving any cartridge valve.
2. If solenoid cartridge is being serviced, remove nut
securing solenoid to the cartridge valve. Carefully slide
solenoid off the valve.
CAUTION
Operate all sweeper hydraulic controls to relieve
system pressure and to avoid injury from pres-
surized hydraulic oil. See Relieving Hydraulic
System Pressure in the General Information sec-
tion of this chapter.
IMPORTANT: Use care when handling the cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
3. Remove cartridge valve with a deep socket wrench.
Note correct location for o–rings, sealing rings and
backup rings. Remove and discard seal kit from valve.
4. Visually inspect the manifold port for damage to the
sealing surfaces, damaged threads and contamination.
5. Visually inspect cartridge valve for damaged sealing
surfaces and contamination.
A. Contamination may cause valves to stick or hang
up. Contamination can become lodged in small valve
orifices or seal areas causing malfunction.
B. If valve sealing surfaces appear pitted or dam-
aged, the hydraulic system may be overheating or
there may be water in the system.
CAUTION
Use eye protection such as goggles when using
compressed air for cartridge valve cleaning.
Pro Sweep 5200
Abrupt movement of internal spools can cause
stored fluid to be released suddenly.
6. Clean cartridge valve by submerging valve in clean
mineral spirits to flush out contamination. Particles as
fine as talcum powder can affect the operation of high
pressure hydraulic valves. If cartridge design allows,
use a wood or plastic probe to push the internal spool in
and out 20 to 30 times to flush out contamination. Be ex-
tremely careful not to damage cartridge. Use com-
pressed air for cleaning.
7. Reinstall the cartridge valve into control manifold:
A. Lubricate new seal kit components with clean hy-
draulic oil and install on valve. The o–rings, sealing
rings and backup rings must be arranged properly on
the cartridge valve for proper operation and sealing.
IMPORTANT: Use care when handling the valve
cartridge. Slight bending or distortion of the
stem tube can cause binding and malfunction.
B. Thread cartridge valve carefully into correct man-
ifold port. The valve should go in easily without bind-
ing.
C. Torque cartridge valve using a deep socket to val-
ues identified in Figure 14.
8. If solenoid cartridge was removed, carefully install
solenoid coil onto the cartridge valve. Install nut and
torque nut to 36 in–lb (4.1 N–m).
9. After assembly, if problems still exist, remove valve
and clean again or replace valve.
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CAUTION
Hydraulic System